JPS6131463Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a micro switch that regulates the push-in depth of a push button, and is particularly effective for drip-proof micro switches that have a rubber cover stretched between the push button and the hole on the case body side. It is something.

Conventionally, in a micro switch, an entrance/exit hole 3 for a push button 2 is provided on the top surface of a case body 1 as shown in FIG. There is a type of micro switch that is exposed on the top surface of the main body 1,
This is particularly problematic because if the push button 2 is pushed in using a plunger 4 with a diameter D that is larger than the diameter d of the push button entrance/exit hole 3, the lower end surface of the plunger 4 will come into contact with the edge of the push button entrance/exit hole 3, thereby regulating the pushing depth. However, in a drip-proof micro switch as shown in FIG. A rubber cover 6 is provided in a watertight manner, so that the diameter D of the plunger 4 is the diameter of the enlarged recess 5.
If it is smaller than d', the lower end of the plunger 4 will fall below the upper surface of the case body 1, pushing the push button 2 down too much, damaging the mechanism inside the switch, and deteriorating the switch function due to deformation and impact. It may cause a malfunction. The present invention is provided as a solution to these drawbacks.

An embodiment of the present invention will be described below in detail with reference to the drawings.
In FIGS. 3 and 4, reference numeral 7 designates the push button of this embodiment, which has an annular groove 9 on the neck of the head 7a to which a rubber cover is attached, and has protrusions 8, 8a on both sides of the lower part. Reference numeral 10 denotes a fixed member to which the base of the movable piece of the switch is pivotally attached, and a swash plate 13 having a hollowed out portion 12 extending downward from the upper part of the portal portion 11 is integrally formed. As shown in FIG. 5, the push button 7 is first inserted from inside the case body into the push button entrance hole 15 provided on the upper surface 14a of the case body 14.
Next, as shown in FIG. 6, the base of the movable piece 19 having the movable contact 18 is pivoted to the portal part 11, and the helical spring 20 is stretched between the front end of the movable piece 19 and the rear part 10a of the fixed piece 10. The fixing piece 10 thus provided is set inside the case body 14. Reference numeral 17 denotes a fixed contact, and the movable contact 18 at the tip of the movable piece 19, which is urged upward by the tensile force of the helical spring 20, comes into elastic contact.
The lower end is pushed up by the side of the spring 20, and the head 7a of the push button 7 protrudes from the upper surface 14a of the case body.
In this case, the front surfaces of the push button protrusions 8 and 8a come into sliding contact with the rear surface of the guide section 22. 16 is push button entrance/exit hole 1
5, and an annular groove 15 around this recess.
The push button 7 and the entrance/exit hole 15 are located between the push button a and the annular groove 9 of the push button.
A rubber cover 21 is stretched to make the gap watertight. In this manner, the side portions of the case body 14 are later covered with side plates (not shown) to complete a drip-proof microswitch. In the above switch, when the push button 7 is pressed and lowered, the lower end 7b of the push button 7 pushes the side of the helical spring 20 from above, and the movable piece 1
9 snaps and the movable contact 18 abuts the lower fixed contact. At this time, the lower end 7b of the push button 7 enters the hollowed out part 12, but since the protrusions 8 and 8a protrude to the extent that they overlap the swash plate 13, the swash plate 13 acts as a stopper for the protrusions 8 and 8a, and the push button 7 The decline of is regulated.

The present invention is as described above, and when the push button is pushed in, the protrusion on the side of the push button comes into contact with the fixing member, so the depth of depression of the push button is regulated. Therefore, it is suitable for drip-proof micro-switches, etc., and this type of switch can be used safely without causing malfunctions due to pressing the button too far. Moreover, the fixing member for preventing the push button from being pushed down too much in the present invention is not a specially provided stopper, but a fixing member that is an essential part of the switch mechanism, and can be used simply by forming a protrusion on the side of the push button. Since it can be manufactured, it is extremely advantageous in terms of workmanship and cost.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional non-drop-proof micro switch, Fig. 2 is a side sectional view of a main part of a conventional example of a drip-proof micro switch, and Fig. 3 is a main part of an embodiment of the present invention. 4 is a front view of the same as above, FIG. 5 is a partially cutaway side view of the case body to explain the state in which the push button is set, and FIG. 6 is a side view of the above embodiment in the completed state. The figure shows the model without the side plate cover. In the figure, 7... push button, 8, 8a... protrusion, 9...
... Ring groove for attaching the rubber cover, 10 ... Fixing member for the main part of the switch mechanism, 11 ... Gate-shaped part, 12 ... Hollowed out part, 13 ... Swash plate, 14 ... Case body,
14a...Top surface of the case body, 15...Push button entrance/exit hole, 16...Expansion hole, 17...Fixed contact, 18...
...Movable contact, 19...Movable piece, 20...Spiral spring, 21...Rubber cover.

Claims (1)

[Scope of utility model registration request] The rear end of the movable piece is supported on the front surface of a fixed member having a hollowed out part, and a spiral spring 20 stretched between the rear part of the fixed member and the movable piece is positioned in the hollowed out part and the spring is pressed down with a push button. In a configuration in which the switch is opened and closed by flipping the movable piece with a snap, a protrusion is formed on the side of the push button, and when the push button is pressed down, the lower end of the push button snaps and presses the spring. A micro switch in which the protrusion on the side portion contacts the side edge of the hollowed out portion of the fixing member.